Sci-fi writer Ben Bova wrote about this back in the early 70s; a story called "Zero Gee." If I remember correctly, the plot had a male astronaut hitting on a female, and finding that weightless cavorting was not so great.

I have a sneaking suspicion some of the Gemini astronauts tried it, too. Apollo, with a third wheel around, would've been tougher.

Titan, a 1979 science fiction novel by John Varley begins with the mission commander Cirroco Jones and the engineer, Bill, engaged in a game called 'No hands'. One can assume the hard dock was the completion of the exercise.

Wow. I was just researching this entire issue about the time this comic was put up. NASA's official statement is that there has been no sex in space. Despite the fact that they often send married couples up together. While I can't find the source anymore, they have copped to masturbating astronauts (good name for a band)

While the thought of sex in space is intriguing, the thought of masturbating astronauts grosses me out. I mean, we've all seen what happens to liquids let loose in zero gravity.. I really didn't want to think about the end result of male masturbation in zero gravity. Thanks, Zaphod (Beeblebrox?!).

I just scrolled through every single comic up to this point because I found this and had to post it, because this comic was the first thing I thought of –http://www.buzzfeed.com/richardhjames/i-for-one-welcome-our-new-sex-lizard-overlords

Sadly, they probably wouldn’t be able to do much since the low pressure of outer space would make it difficult for one to have a boner to begin with. Not to mention that with every thrust you kinda just propel yourself forward, causing you to bump into things a lot.

Oh, and first comment on your comic! I love this so much. You earned my respect, good sir!